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Many text editors keep backup files. If you are really lucky, there might be something like yourfile.tex~ including a previous version of your file.
install testdisc and use photorec command.
Good luck
& hat ?install testisk linux with this command sudo --testDisk so that good is that work
I found the below post helpful but to answer it here is little complex. Recovery generally require expertise, if someone try to recover without improper knowledge can experience more damage.
http://www.cyberciti.biz/tips/linux-ext3-ext4-deleted-files-recovery-howto.html